Si/Ge Double-Layered Nanotube Array as a Lithium Ion Battery Anode
| Autor: | Won Il Park, Seok-Gwang Doo, Huanyu Cheng, Taeseup Song, Jianliang Xiao, Yonggang Huang, Jae Man Choi, Hyuk Chang, Ungyu Paik, Heechae Choi, Jin Hyon Lee, Hyungkyu Han, Dong Su Yoo, Moon Seok Kwon, John A. Rogers, Dong Hyun Lee, Yong-Chae Chung, Hansu Kim |
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| Rok vydání: | 2011 |
| Předmět: |
Battery (electricity)
Silicon Nanotube Materials science Lithium vanadium phosphate battery Inorganic chemistry General Physics and Astronomy chemistry.chemical_element Lithium Conductivity Thermal diffusivity Electric Power Supplies Materials Testing General Materials Science Particle Size Electrodes Ions Nanotubes Germanium business.industry General Engineering Equipment Design Anode Equipment Failure Analysis chemistry Electrode Optoelectronics Crystallization business |
| Zdroj: | ACS Nano. 6:303-309 |
| ISSN: | 1936-086X 1936-0851 |
| Popis: | Problems related to tremendous volume changes associated with cycling and the low electron conductivity and ion diffusivity of Si represent major obstacles to its use in high-capacity anodes for lithium ion batteries. We have developed a group IVA based nanotube heterostructure array, consisting of a high-capacity Si inner layer and a highly conductive Ge outer layer, to yield both favorable mechanics and kinetics in battery applications. This type of Si/Ge double-layered nanotube array electrode exhibits improved electrochemical performances over the analogous homogeneous Si system, including stable capacity retention (85% after 50 cycles) and doubled capacity at a 3C rate. These results stem from reduced maximum hoop strain in the nanotubes, supported by theoretical mechanics modeling, and lowered activation energy barrier for Li diffusion. This electrode technology creates opportunities in the development of group IVA nanotube heterostructures for next generation lithium ion batteries. |
| Databáze: | OpenAIRE |
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